I have found over the years that it is best to set up two separate accounts for yourself: Standard and Administrator. Standard is best for everyday use, such as web browsing, email, photos, music, word processing, and so on. Adminstrator is typically used only to install new software or updates—never for normal use.
The theory is that a standard user is not able to change system settings and that malicious software is less likely to do any damage because of this. Administrators have full access to all settings and all files on the system, making it a risky user account to use for normal use.
Open up the System Preferences on the Apple Menu, as shown in the following screen.
Under System, click Users & Groups, ...